$width: 170px;
$height:150px;
$coler: #594;

@mixin aaa($width, $height, $coler) {
  width: $width;
  height: $height;
  background-color: $coler;
}

.a {
  @include aaa(50px, 50px, red);

  .b {
    width: 100px;
    height: $height;
    background-color: aqua;
  }
}

.c {
  width: $width;
  height: $height;
  background-color: $coler;
}
